Because the date is in the small print and not wearing glasses. err 3 looked like an 8 ?

 

me too the 3 looked like an 8,but i will give an answer anyway for anyone who may want 18 all the way around.
first we have on the crossfire stock size
225/40-18 on the front, they are 8.9" side wall 3.6" rim to ground and 25.1" tall 30 offset
255/35-19 on the rear , they are 10." side wall 3.5" rim to ground and 26" tall 20 offset
( u will need 15 to 20mm spacer for the rear)

235/40-18 they are 9.3 wide, 3.7 to ground and 25.4 tall ( u will need 15 to 20mm spacer for the rear)
245/40-18 they are 9.6 wide, 3.9 to ground and 25.7 tall these may also work just check the rub on the front
( u will need 15 to 20mm spacer for the rear)

I have a set of 17" amg rims that i may use soon they are rear 8.5 wide offset 30 front 7.5 offset 35
i may not need a spacer, the tires are going to be:
front 205/50-17 8.1 wide 4. to ground and 25.1 tall or 225/45-17 8.9 wide 4. to ground 25 tall
rear 285/40-17 11.2 wide 4.5 to ground 26 tall or 335/35-17 13.2 wide 4.6 to ground 26.2 tall or
255/45-17 10 wide 4.5 to ground 26 tall

"Jim's book on tires"